package com.sjt.mylibrary.utils;

import android.text.InputFilter;
import android.text.Spanned;

public class InputFilterMinMax implements InputFilter {
    private int min, max;

    public InputFilterMinMax(int min, int max) {
        this.min = min;
        this.max = max;
    }

    public InputFilterMinMax(String min, String max) {
        this.min = Integer.parseInt(min);
        this.max = Integer.parseInt(max);
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        try {
            if (dend >= max) return "";
            int input = end + dend;
            if (isInRange(min, max, input)) return source;
            return source.subSequence(0, max - dend);
        } catch (NumberFormatException nfe) {

        }
        return "";
    }

    private boolean isInRange(int a, int b, int c) {
        return b > a ? c >= a && c <= b : c >= b && c <= a;
    }
}
